So MF doesn't kill those guys, but giving them life-crippling injuries is okay? Sounds like Batman
MF's resolution to the other gang bosses in the comic seems a lot like what Damian Wayne says in the above clip (no need to watch the whole thing; it was just the easiest place to find it).
"So you won't kill, but you're fine with traumatic brain injuries." - Damian Wayne
Your common Superhero Paradox. Except in this case, MF could've killed those guys and it wouldn't have resulted in a lore-breaking moment. Yes, she justifies it in that it would create a power vacuum, and nature abhors a vacuum, but I just thought I'd bring it up.
Discuss away.